Mojo: validate nullability in Java bindings.

mojo/public/tools/bindings/pylib/mojom/generate/module.py

 # Copyright 2013 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # This module's classes provide an interface to mojo modules. Modules are
 # collections of interfaces and structs to be used by mojo ipc clients and
 # servers.
 #
 # A simple interface would be created this way:
 # module = mojom.generate.module.Module('Foo')
@@ skipping 359 matching lines @@
 
 
 def IsInterfaceRequestKind(kind):
   return isinstance(kind, InterfaceRequest)
 
 
 def IsEnumKind(kind):
   return isinstance(kind, Enum)
 
 
+def IsReferenceKind(kind):
+  return isinstance(kind, ReferenceKind)
+
+
 def IsNullableKind(kind):
-  return isinstance(kind, ReferenceKind) and kind.is_nullable
+  return IsReferenceKind(kind) and kind.is_nullable
 
 
 def IsAnyArrayKind(kind):
   return IsArrayKind(kind) or IsFixedArrayKind(kind)
 
 
 def IsObjectKind(kind):
   return IsStructKind(kind) or IsAnyArrayKind(kind) or IsStringKind(kind)
 
 
@@ skipping 14 matching lines @@
 def IsMoveOnlyKind(kind):
   return IsObjectKind(kind) or IsAnyHandleKind(kind)
 
 
 def HasCallbacks(interface):
   for method in interface.methods:
     if method.response_parameters != None:
       return True
   return False